Synthesis of All-Conjugated Block Copolymers PPP-P3HT by Using Grignard Metathesis and Study of Copolymer Blending with C60 Derivatives PCBM/ICBA: Hybrid Morphology, Optoelectronic Property and Solar Cell Application
Date Issued
2011
Date
2011
Author(s)
Kau, Kuo-Chang
Abstract
In this study, all-conjugated rod-rod poly(2,5-dihexyloxy-p-phenylene)- b-poly(3-hexylthiophene) (PPP-P3HT) block copolymers with different block ratio between PPP and P3HT were synthesized and their self-assembly behavior was investigated. A series of monodisperse PPP-P3HT block copolymers consisting of a nearly constant molecular weight PPP block and a different molecular weight P3HT block was synthesized via a sequential Grignard metathesis method (GRIM). Gel permeation chromatographer, NMR spectra and transmission electron microscopy were used to characterize the block copolymers.
The blending system of PPP-P3HT and PCBM/ICBA was made using different solvents such as dichlorobenzene and toluene followed by drop-casting/spin-coating the resulting solutions for the fabrication of PPP-P3HT/PCBM or PPP-P3HT/ICBA thin films. These systems afford different properties, such as morphology and optical properties. In addition, the morphology, thermal and optoelectronic properties of the blending system were studied by using FTIR, UV-VIS, XRD, photoluminescence spectroscopy and transmission electron microscopy. We find that the aggregation of polymer blending PCBM can be dispersed by the self-assembly of PPP-P3HT and the dispersion of PPP-P3HT/ICBA is better than the PPP-P3HT/PCBM in ODCB solvent. Besides, The existence domain of PCBM in PPP or P3HT can be controlled by the used solvents and fabrication in the blending system of PPP-P3HT and PCBM. the Incident Photon Conversion Efficiency in the PPP-P3HT block copolymers blending with ICBA can be performed up to 2.0%, and the solar cell performance of PPP-P3HT/PCBM films was investigated. The best efficiency is 3.50%.
Subjects
Grignard Metathesis
PCBM
Polymer Solar Cell
conducting polymers
Type
thesis
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